Breaking change but its only been out for a few hours

sorts by default, no need for a constraint
adds reverse, and by default sorts the same way unix sort does, least to greatest

README.md

@@ -12,20 +12,44 @@ This only exists because more people dont adopt: https://samver.org/ which is so
 
 ## Usage
 
+sorts versions you pass to it over a pipe.
 
 ```
 Usage of ./semversort:
   -constraint string
-    	list versions greatest to least, if versions pass given constraint.
+    	list versions only if versions pass given constraint
   -greatest
     	display the greatest version for a given list
   -least
     	display the least version for a given list
+  -reverse
+    	lists verions greatest to least
 ```
 
-example:
+examples:
 
-`echo -e "1.2.3\n3.4.5" | ./semversort -constraint='>=0.0.0'`
+```
+[~]> echo -e "1.2.3\n4.5.6\n2.9.100+woot\n0.3.1"
+1.2.3
+4.5.6
+2.9.100+woot
+0.3.1
+[~]> echo -e "1.2.3\n4.5.6\n2.9.100+woot\n0.3.1" | ./semversort
+0.3.1
+1.2.3
+2.9.100+woot
+4.5.6
+[~]> echo -e "1.2.3\n4.5.6\n2.9.100+woot\n0.3.1" | ./semversort -constraint='>=2.0.0'
+2.9.100+woot
+4.5.6
+[~]> echo -e "1.2.3\n4.5.6\n2.9.100+woot\n0.3.1" | ./semversort -reverse
+4.5.6
+2.9.100+woot
+1.2.3
+0.3.1
+[~]> echo -e "1.2.3\n4.5.6\n2.9.100+woot\n0.3.1" | ./semversort -greatest
+4.5.6
+```
 
 more info on semver constraints:
 

bin/build

@@ -0,0 +1,2 @@
+GOOS=linux GOARCH=amd64 go build -o semversort-linux-amd64
+GOOS=darwin GOARCH=amd64 go build -o semversort-darwin-amd64

go.sum

@@ -1,3 +1,2 @@
-github.com/Masterminds/semver v1.5.0 h1:H65muMkzWKEuNDnfl9d70GUjFniHKHRbFPGBuZ3QEww=
 github.com/Masterminds/semver/v3 v3.1.1 h1:hLg3sBzpNErnxhQtUy/mmLR2I9foDujNK030IGemrRc=
 github.com/Masterminds/semver/v3 v3.1.1/go.mod h1:VPu/7SZ7ePZ3QOrcuXROw5FAcLl4a0cBrbBpGY/8hQs=

main.go

@@ -16,19 +16,16 @@ func main() {
 		greatestFlag bool
 		leastFlag    bool
 		constraint   string
+		reverseFlag  bool
 	)
 
 	flag.BoolVar(&greatestFlag, "greatest", false, "display the greatest version for a given list")
 	flag.BoolVar(&leastFlag, "least", false, "display the least version for a given list")
-	flag.StringVar(&constraint, "constraint", "", "list versions greatest to least, if versions pass given constraint.")
+	flag.StringVar(&constraint, "constraint", "", "list versions only if versions pass given constraint")
+	flag.BoolVar(&reverseFlag, "reverse", false, "lists verions greatest to least")
 
 	flag.Parse()
 
-	if !greatestFlag && !leastFlag && constraint == "" {
-		flag.Usage()
-		os.Exit(0)
-	}
-
 	reader := bufio.NewReader(os.Stdin)
 	var rawVersions []string
 
@@ -56,32 +53,41 @@ func main() {
 		versions[i] = v
 	}
 
-	// greatest to least
-	sort.Sort(sort.Reverse(semver.Collection(versions)))
+	// least to greatest
+	sort.Sort(semver.Collection(versions))
 
 	if greatestFlag {
-		fmt.Println(versions[0])
+		fmt.Println(versions[len(versions)-1])
 		os.Exit(0)
 	}
 
 	if leastFlag {
-		fmt.Println(versions[len(versions)-1])
+		fmt.Println(versions[0])
 		os.Exit(0)
 	}
 
+	//greatest to least
+	if reverseFlag {
+		sort.Sort(sort.Reverse(semver.Collection(versions)))
+	}
+
 	if constraint != "" {
 		c, err := semver.NewConstraint(constraint)
 		if err != nil {
 			fmt.Printf("Error parsing constraint '%s': %s\n", constraint, err.Error())
 			os.Exit(3)
 		}
+
 		for _, v := range versions {
 			status, _ := c.Validate(v)
 			if status {
 				fmt.Println(v)
 			}
 		}
-		os.Exit(0)
+	} else {
+		for _, v := range versions {
+			fmt.Println(v)
+		}
 	}
-
+	os.Exit(0)
 }